I think for a second, and then I write equal amounts (70) next to both hotness and kindness, then 40 next to income and 20 next to fidelity.“Oh wow,” he says.“What? Usually women allocate more to fidelity and less to physical attractiveness.

Maybe you think fidelity is something people can cultivate over time?

Edward Royzman, a psychology professor at the University of Pennsylvania, asks me to list four qualities on a piece of paper: physical attractiveness, income, kindness, and fidelity.